A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

Even Henry David Thoreau found this glacial pothole irresistible.

Every year, the colorful murals of Montreal get a complete makeover.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

This free, take-a-book shop seems like a trick but isn't.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The United States Capitol's former columns still stand.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Collect holy water from a Bronx grotto.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Detailed facade of a brownstone in Boerum Hill.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The oldest surviving synagogue in New York City is now a soaring art space.